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EP0334786A3 - Recycling process for slag, especially salts ...

A process for recovering salt and solid pro­ ducts, for example metallic aluminium and oxides such as alumina, from slag resulting from the refining of aluminium scrap in rotary-hearth furnaces, in which the whole of the scrap is triturated in suitable screens and the resulting powder, once the metallic par­ ticles have been separated is washed with water to sepa­ rate the liquid and solid ...

Aluminium salt slag / salt cake / black dross

Aluminium Recycling - Metallurgical Process Management The amount of dross and slag generated during the metallurgical process of Secondary Aluminium Production depends on: •The type of scrap, resulting in different amounts of oxides and contaminants ! •The type of furnace in use ! •The metallurgical process management itself !

Rio Tinto signs up Ultromex to treat landfill aluminium ...

Salt slag, also referred to as salt cake or black dross is a waste material generated by secondary aluminium processing (the recycling and smelting of new aluminium from aluminium scrap, dross and other industry wastes). Due to its reactivity with water and the nature of the contaminants it contains, salt slag (or salt cake as it sometimes ...

how to recycle secondary aluminium salt slag

Aluminum residue waste for possible utilisation as a, - Know More. lesser metal content and is generated during aluminium recycling Black dross consists of a mixture of aluminium oxides and slag, with recoverable aluminium content ranging between 12 and 18%, and larger salt content ie, higher than 40% compared to white dross The term 'salt cake' signifies the non metallic residue ...

Aluminum Recycling - Engitec

the ste process – treatment of aluminum salt slag The Engitec proprietary technology for the secondary aluminum industry is the STE process for the treatment of aluminum salt slag. The process is suitable for large or for small productions and can be installed directly at the aluminum recyclers' site.

Secondary aluminum (REKAL) - K+S Aktiengesellschaft

K+S recycles salt slag from the secondary aluminum industry completely residue-free. By this we mean: completely, one hundred percent. Our specially developed REKAL® plant extracts the reusable aluminum from the slag. The process is rounded off by the separated substances potassium chloride, aluminum oxide and ammonium sulfate.

Resal - grupo-otua.com

Resal. Our company specialises in recovering salt slag generated in the aluminium recycling process. We use our own technology to provide a "green" solution and offer a comprehensive service for managing the waste generated by the secondary smelting process at aluminium refineries. Our recycling process is based on classifying the different ...

Recyled alumina from Ultromex - Salt slag recycling / salt ...

Recyled alumina from Ultromex ULUMINA. A rich source of secondary alumina, reclaimed from aluminium salt slag recycling. A sustainable & economic alternative to bauxite derived alumina for many industrial and manufacturing applications.

Alkali-Activated Binders Using Bottom Ash from Waste-to ...

authors [32]. PAVAL® (PV) was also used as a source of reactive aluminium. PV is an industrial waste generated from the salt slag recovery phase of the secondary aluminium recycling process [33]. This aluminium salt slag is processed to separate PV (mainly composed of aluminium oxides) from metallic aluminium and flux, as well as from scarified

Salt slag recycling / salt cake recycling & treatment ...

SALTROMEX Salt Slag Recycling SALTROMEX plants, using our patented processes, are designed to help secondary aluminium smelters of all sizes treat and recycle their own salt slag to recover valuable aluminium for re-melt, recover the flux salts to use again while leaving non-odourous, valuable aluminium oxide residues.

Recycling of waste from the

•Salt with solids solidified, resulting in salt cake •Salt cake is sent to the UK for recycling •Salt for reuse in process •Aluminium 5 –10% •Al oxide and other oxides to cement •Ammonium sulfate •Alur/Kratus is planning to start recycling of salt cake NaCl 60 –70% KCl 35 –25% CaF 2 5% Al metal 2 –8% Salt 20 –40% AlN 5- 15 %

Aluminium Dross Recycling - A New Technology for Recycling ...

The worldwide aluminium industry produces nearly five million tonnes of furnace waste each year. Known as dross, the residual waste material is produced from any process in which aluminium is melted, and is left behind after conventional recycling has been carried out. Traditionally, black (which has a much higher salt content) and white dross ...

BENEFITS MANUFACTURING CERAMIC PRODUCTS FROM …

current aluminum black dross/salt cake landfill waste is processed ... recycling of secondary aluminum black dross/saltcake waste streams • Steel-making slag products and ... slag, alumina additives, and deoxidation products.Although salt processing is not part of

Aluminum melting: slag formation – aluminium-guide.com

Aluminum dross is a mixture of aluminum metal and aluminum oxide. The increased amount of ash is a problem, since it leads to an increased loss of aluminum, It requires its processing and recycling. Therefore, reducing the aluminum slag is one of the most important tasks of any foundry.

What is an aluminum recycling smelter? – NO SMELTER HERE

"Black dross" or "salt cakes" refer to aluminum dross from practices that use salt fluxes. The dross is crushed, screened and melted in a rotary furnace where the molten aluminum is collected in the bottom. The resulting salt slag is a waste product. To reduce this waste more of the remaining metallics may be leached into water and ...

Aluminium recycling and environmental issues of salt slag ...

Salt slags are the byproducts of the secondary aluminium industry, which should be recycled and processed in a proper way by taking the environmental impact into consideration.

(PDF) Recycling and environmental issues of metallurgical ...

High slag viscosity will lead to more fine aluminium metal entrapped in the salt slag (may also be seen as a high temperature slurry), and thus increase the load of salt slag recycling. Keywords: recycling, environment, metallurgy, slags, fluxes, salts.

Efficient Aluminium Salt cake Recycling Technology - CORDIS

By having an in situ efficient salt slag recycling system, the average secondary aluminium recyclers with a recycling capacity of producing 10,000 tonnes p.a. of salt slag is calculated to save approximately €350,000 in landfill cost (based on landfill cost of €70/T), approximately €225,000 p.a. on transportation to landfill and reduce ...

Aluminium salt slag characterization and utilization--a ...

Aluminium salt slag (also known as aluminium salt cake), which is produced by the secondary aluminium industry, is formed during aluminium scrap/dross melting and contains 15-30% aluminium oxide, 30-55% sodium chloride, 15-30% potassium chloride, 5-7% metallic aluminium and impurities (carbides, nitrides, sulphides and phosphides).

ARTICLE: Secondary Aluminum Processing Waste – Ensuring ...

However, aluminum recycling also generates waste products and these are referred to as secondary aluminum processing wastes, which are comprised of two components. By far the largest in terms of generation is saltcake, which is the slag generated during the recovery of aluminum scrap and dross in rotary furnaces.

Method of recycling salt slag aluminum production

The closest in technical essence of the present invention is a method of recycling of salt slag secondary aluminum production by washing it with water, followed by drying the obtained precipitate at a temperature of 100-110 o With its grinding, to obtain a powder, which is used in the preparation of concrete mixture as a blowing agent [4].

Origins of Aluminium Salt Slag – RVA – Recycling

Origins of Aluminium Salt Slag. In the aluminium refining process, scrap is melted in rotary or reverbatory furnaces under a bath of molten salt which floats on the metal surface. The salt is typically a eutectic or near-eutectic mixture of sodium and potassium chlorides …

A synthetic source of alumina from aluminium slags - …

arisings of salt slag closely follow output from that industry. Between 300-800 kg of salt slag are produced for every tonne of secondary aluminium alloy. In 2009 worldwide secondary aluminium production stood at around 11 million tonnes. Taking a conservative figure of 400 kg slag/tonne aluminium, salt slag arisings may be estimated

Aluminum Dross Furnace Salt Slags Processing

Disposal of the salt slag produced during the processing of aluminum dross and scrap is of particular interest to the secondary aluminum industry. Melting of these materials is carried out under a salt flux cover to dissolve the contaminants, mostly aluminum oxide, and to optimize the recovery of aluminum metal.

New Dry Recycling System for Aluminium Salt Cake from ...

A simplified dry recycling process to recover the 5-10% of aluminium which remains in the aluminium salt cake produced in the smelting process of secondary aluminium, has been developed by German recycling equipment manufacturer, -Sonthofen. According to the company, to date the recovery of this aluminium has thus far proven difficult, costly and time consuming.

Recycled Alumina from Aluminium Salt Slag: Origins ...

Aluminium Granules Returned to secondary aluminium production cycle Salt Returned to refiners for melting process Recycled Alumina (Valoxy) Non-metallurgical applications as substitute bauxite/alumina The conversion of salt slag, a hazardous waste of the aluminium …

Recycling and environmental issues of metallurgical slags ...

metal production, as well as waste incineration, and recycling of salt fluxes in secondary metal production. In addition, the environmental issues of the metallurgical slags are addressed. The metallurgical oxide slags have stone-like properties and, thus, their major applications are in civil engineering field.

Recovery of Aluminum from Industrial Waste (Slag) by ...

Slag of aluminum is a residue which results during the melting process of primary and secondary aluminum production. Salt slag of aluminum is hazardous solid waste according to the European Catalogue for Hazardous Wastes. Hence, recovery of aluminum not only saves the environment, but also has advantages of financial and economic

Befesa Aluminium :: Salt slags and SPL Recycling Services

Salt slags and SPL Recycling Services. Through a 5 steps process: Service, collection and transporting of hazardous residues. Milling and sorting depending on the corn measure from the received residue. Reaction and dissolution of the hazardous components and salts. Separation and washing of the secondary oxide products. Crystallisation of salts.

how to recycle secondary aluminium salt slag

Aluminium recycling Wikipedia. Aug 12 The recycling of aluminium is very important since the residues of this Management of the Salt Cake Generated at Secondary Aluminium Aluminum salt slag recycling solutions from Ultromex A new way to treat salt slag and recover valuable aluminum Find out moreAluminium recycling is the process by which scrap aluminium can be reused in products after …

An overview of recovery of metals from slags - ScienceDirect

Approximately 0.5 tons of salt slag arises when producing one ton of secondary aluminum (Kirchner, 1991, Lopez et al., 1994). Over recent years, the increasing aluminum recycling has caused a rapid increase of salt slag. Salt slag contains a great amount of water-soluble compounds.

Recycling of slags and furnace bricks in non-ferrous ...

Up to 100,000 tons of non-ferrous slag and furnace bricks with a feed size of up to 0.5 m will be crushed to 0/2 mm so that the recycle can be pneumatically conveyed to or into the kiln. This project is a classic brown-field project, whereby the stationary plant is implemented in the existing recycling process.

Environmental Guidelines for Aluminum Manufacturing

the melting of aluminum scrap that is coated with plastic. Salt slag processing emits hydrogen and methane. Solid wastes from the production of secondary aluminum include particulates, pot lining refractory material, and salt slag. Particulate emissions, possibly containing heavy metals, are also associated with secondary aluminum production.

Saltcake | The Aluminum Association

Saltcake is the slag generated during the recovery of aluminum in Rotary Furnaces. To maximize metal recovery, a salt flux is often added to aluminum scrap and dross in the recovery process, and the residue resulting from that aluminum recovery process is referred to as saltcake or saltslag. Saltcake typically contains 3-10% metallic aluminum ...

Aluminium recycling and environmental issues of salt slag ...

Salt slags are the byproducts of the secondary aluminium industry, which should be recycled and processed in a proper way by taking the environmental impact into consideration. This article provides qualitative assessment on 10 different commercial aluminium scraps for their relative recyclability via well-designed and controlled laboratory ...

Aluminum residue waste for possible utilisation as a ...

lesser metal content and is generated during aluminium recycling. Black dross consists of a mixture of aluminium oxides and slag, with recoverable aluminium content ranging between 12 and 18%, and larger salt content i.e., higher than 40% compared to white dross. The term 'salt cake' signifies the non metallic residue obtained from dross